CA2024765A1 - Method of detecting a cable fault and switching to a redundant cable in a universal local area network - Google Patents

Method of detecting a cable fault and switching to a redundant cable in a universal local area network

Info

Publication number
CA2024765A1
CA2024765A1 CA002024765A CA2024765A CA2024765A1 CA 2024765 A1 CA2024765 A1 CA 2024765A1 CA 002024765 A CA002024765 A CA 002024765A CA 2024765 A CA2024765 A CA 2024765A CA 2024765 A1 CA2024765 A1 CA 2024765A1
Authority
CA
Canada
Prior art keywords
cable
module
cables
redundant
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002024765A
Other languages
French (fr)
Other versions
CA2024765C (en
Inventor
Scott S. Mostashari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell Inc
Original Assignee
Honeywell Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honeywell Inc filed Critical Honeywell Inc
Publication of CA2024765A1 publication Critical patent/CA2024765A1/en
Application granted granted Critical
Publication of CA2024765C publication Critical patent/CA2024765C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40169—Flexible bus arrangements
    • H04L12/40176—Flexible bus arrangements involving redundancy
    • H04L12/40182—Flexible bus arrangements involving redundancy by using a plurality of communication lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/417—Bus networks with decentralised control with deterministic access, e.g. token passing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Small-Scale Networks (AREA)

Abstract

A method by Which the each module of a token passing local area network complying with IEEE standard 802.4 determines if the communication cable from which it is receiving signals is faulty and switches to a second, or redundant cable. Each module transmits the same signals over both cables, but can receive signals from only one, its selected cable. In normal operations, all modules receive signals from the same cable. Each of the modules has the capability of detecting faults in its selected cable, and of switching cables so that its second cable becomes its selected cable. Each module also has the capability of initiating the process of re-establishing the network whenever a module switches cables in response to detecting a fault. Each module in response to the process of initiating re-establishing the network, switching cables so that all modules are listening to, or receiving signals from the same cable. Each module periodically checks to determine if low level noise is present on its selected cable, and if it is, the module switches cables.
A module in the listen only mode of operation will periodically check to determine if the signals it is receiving or valid. If not, it will switch cables. A module whose redundant cable has been identified as being silent, will periodically check to determine if its redundant cable remains silent.
CA002024765A 1989-09-08 1990-09-06 Method of detecting a cable fault and switching to a redundant cable in a universal local area network Expired - Lifetime CA2024765C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/404,756 US4964120A (en) 1989-09-08 1989-09-08 Method of detecting a cable fault and switching to a redundant cable in a universal local area network
US404,756 1989-09-08

Publications (2)

Publication Number Publication Date
CA2024765A1 true CA2024765A1 (en) 1991-03-09
CA2024765C CA2024765C (en) 2002-12-17

Family

ID=23600906

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002024765A Expired - Lifetime CA2024765C (en) 1989-09-08 1990-09-06 Method of detecting a cable fault and switching to a redundant cable in a universal local area network

Country Status (6)

Country Link
US (1) US4964120A (en)
EP (1) EP0416942B1 (en)
JP (1) JP2548042B2 (en)
AU (1) AU642426B2 (en)
CA (1) CA2024765C (en)
DE (1) DE69033050T2 (en)

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CN116074184A (en) * 2023-03-21 2023-05-05 云南莱瑞科技有限公司 Network fault early warning system of power dispatching center

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116074184A (en) * 2023-03-21 2023-05-05 云南莱瑞科技有限公司 Network fault early warning system of power dispatching center
CN116074184B (en) * 2023-03-21 2023-06-27 云南莱瑞科技有限公司 Network fault early warning system of power dispatching center

Also Published As

Publication number Publication date
JP2548042B2 (en) 1996-10-30
EP0416942A3 (en) 1992-12-02
CA2024765C (en) 2002-12-17
EP0416942A2 (en) 1991-03-13
EP0416942B1 (en) 1999-04-14
US4964120A (en) 1990-10-16
DE69033050T2 (en) 1999-11-11
JPH03106145A (en) 1991-05-02
DE69033050D1 (en) 1999-05-20
AU6190090A (en) 1991-03-14
AU642426B2 (en) 1993-10-21

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Legal Events

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EEER Examination request
MKLA Lapsed
MKEC Expiry (correction)

Effective date: 20121202